[maglev] Initialize loop merge to uninitialized predecessor
Explicitly initialize the loop merge's back-edge predecessor to a specfic "uninitialized" value, distinct from nullptr (which marks dead loops) and done in both debug and release modes. Bug: v8:7700 Change-Id: I6a845cc4dbd7da75954f78607e69a5d4e2ec1ec7 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3645114Reviewed-by: Toon Verwaest <verwaest@chromium.org> Commit-Queue: Toon Verwaest <verwaest@chromium.org> Auto-Submit: Leszek Swirski <leszeks@chromium.org> Cr-Commit-Position: refs/heads/main@{#80525}
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